Use of reverse phase C-18 minicolumns for concentrating water-soluble hydrocarbons

Octanol-water partition coefficients of polychlorinated biphenyl congeners

“…and half filled with solid support. The column eluant was collected in a preweighed receiving flask, reweighed, and extracted (efficiency >90%) with a Waters Associates C-18 reverse-phase Sep-Pak column (19,27). Aqueous concentrations were then determined by injection of an aliquot (10 ^L) of the hexane eluant (5 mL) from the Sep-Pak column into a Tracor Model 560 GC equipped with an electron capture detector (63Ni, 350 °C) and linearizer.…”

Analysis of pesticides in seawater after enrichment onto C8 bonded-phase cartridges

“…Several manufacturers now produce cartridges packed with a variety of phases at a reasonable cost. These cartridges have been used to preconcentrate hydrocarbons (9)(10)(11)(12), phenols (13,14), herbicides (7,15,16), priority pollutants (17), and insecticides from fresh (7,18,19) and salt (19) water. Most of these methods have involved water samples of 200 mL or less, smaller than the volumes required for monitoring a runoff event.…”

Aliphatic Hydrocarbons

“…Infrared absorbance has also been used to measure C10-C11 paraffinic hydrocarbons in inhalation chambers (272). Decane may also be concentrated in water using reverse-phase C18 minicolumns and detected using a gas chromatograph with a flame ionization detector (153). EPA Method 1625 is used to measure semivolatile organic compounds, including decane, in water by isotope dilution gas chromatography-mass spectrometry (273).…”

“…The C6-C10 alkynes, when ingested, may present aspiration hazards (153). The taste threshold of 1-decyne is 0.1 ppm, and odor recognition occurs at 4 ppm in air (72).…”